SOLUTION: The sum of two numbers is 39. One number is 7 more than the other. Find the two numbers. (Show all steps and explain them please).

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Question 394073: The sum of two numbers is 39. One number is 7 more than the other. Find the two numbers. (Show all steps and explain them please).
Answer by pie90010(44) About Me  (Show Source):
You can put this solution on YOUR website!
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let x be one number
and y be the other number
x+%2B+7+=+y
line this up with the other equation
-x+%2B+y+=++7
+x+%2B+y+=+39
now you can Cancel the X's
2y+=+36
y+=+18
now that you know y, plug it in to find x
x+%2B+y+=+39
x+%2B+18+=+39
x+=+21
the 2 numbers are 21 and 18